Is there a current issue with your co-worker right now? Your dream may be showing you how to sort it out. Was your co-worker helpful or harmful to you in your dream? Or was your co-worker helpless? If harmful you may need to address this in waking life. Sometimes your co-worker will be standing in for a aprt of your personality that is like him or her. What quality or fault do you have in common with this person? Or what quality of this person would you like to have for yourself?